Consider taking L-theanine with your caffeine. When taken with caffeine, it smooths out the jitters and produces a subtle sense of clarity and focus; it will probably improve your ability to think on less caffeine.
If you are using caffeine for energy, you probably should improve your diet first, instead, and make sure you get enough sleep (which I know can be hard in crunch mode, but it makes your awake time much more productive). I love my coffee as much as the next person, but using caffeine to drive my ability to work has never produced good effects.
http://www.sciencedirect.com/science/article/pii/S0301051107...
(Lots of other articles about the effect cited in https://en.wikipedia.org/wiki/Theanine too)
If you are using caffeine for energy, you probably should improve your diet first, instead, and make sure you get enough sleep (which I know can be hard in crunch mode, but it makes your awake time much more productive). I love my coffee as much as the next person, but using caffeine to drive my ability to work has never produced good effects.